WARNING: CPU: 0 PID: 9316 at net/core/filter.c:3848 bpf_xdp_adjust_tail+0x1a8/0x1b0 net/core/filter.c:3837
Modules linked in:
CPU: 0 PID: 9316 Comm: syz-executor.1 Not tainted 5.15.123-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : bpf_xdp_adjust_tail+0x1a8/0x1b0 net/core/filter.c:3837
lr : ____bpf_xdp_adjust_tail net/core/filter.c:3848 [inline]
lr : bpf_xdp_adjust_tail+0x1a4/0x1b0 net/core/filter.c:3837
sp : ffff80001d0276d0
x29: ffff80001d0276d0 x28: ffff0000da258fc0 x27: 1ffff00003a04f1b
x26: ffff0000da258fa1 x25: dfff800000000000 x24: 0000000000001100
x23: ffff0000da258f81 x22: 0000000000000020 x21: ffff80001d0278d0
x20: ffff80001d0278d8 x19: ffff800016d01000 x18: 0000000000000201
x17: ff80800008335eb0 x16: 0000000000000002 x15: ffff800008335eb0
x14: 00000000ffffffff x13: ffffffffffffffff x12: 0000000000040000
x11: 00000000000011dd x10: ffff80001e379000 x9 : 9c304273f21a7f00
x8 : 9c304273f21a7f00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001d026e38 x4 : ffff8000149dfca0 x3 : ffff800008335ffc
x2 : 0000000000000001 x1 : 0000000000000200 x0 : ffffffffffffffea
Call trace:
 bpf_xdp_adjust_tail+0x1a8/0x1b0 net/core/filter.c:3837
 bpf_prog_5f065984e7f319a0+0x3c/0x940
 bpf_dispatcher_xdp_func+0x30/0x44 net/core/filter.c:10763
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run_xdp include/linux/filter.h:800 [inline]
 tun_build_skb drivers/net/tun.c:1689 [inline]
 tun_get_user+0x2634/0x3774 drivers/net/tun.c:1796
 tun_chr_write_iter+0xfc/0x20c drivers/net/tun.c:2018
 call_write_iter include/linux/fs.h:2103 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x87c/0xb3c fs/read_write.c:594
 ksys_write+0x15c/0x26c fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 431
hardirqs last  enabled at (430): [<ffff80000832baf0>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (431): [<ffff800011958ed0>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:387
softirqs last  enabled at (400): [<ffff8000080300b4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (410): [<ffff80000c8d91b0>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace c01d637cd75e0548 ]---
Illegal XDP return value 4294967274, expect packet loss!